Drill



H. KIMMAN.

DRILL.

7 APPLICATION FILED JULY 22,1920. 1 ,4G L53O, Patented Jan. 24, 1922.v

3 SHEETS-SHEET l- H. J. KIMMAN.

DRILL.

v APPLICATION FILED JULY 22,1920. 1,404,530. ted. Jan- 24,1922.

3 SHEETSSHEET 2- UNITED STATES PATENT OFFICE.

HENRY J. KIMMAN, OF CLEVELAND, OHIO, ASSIGNOR TO CHICAGO PNEUMATIC TOOL COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW JERSEY.

DRILL.

Application filed July 22,

To all whom it may concern:

Be it known that I, HENRY J. KIMMAN, a citizen of the United States, residing at Cleveland, Cuyahoga County, Ohio, have invented certain new and useful Improvements in Drills, of which'the following is a specification.

My invention has relation to multiple cylinder motors or engines of a portable drill, such as a pneumatic drill, and more particularly to the toggle connections between the cranks and the connecting rods of pistons of the opposed cylinders which are generally placed at an angle of 90 degrees of each other.

The main object of my invention is to provide a simple and efiicient toggle'connection which is unprovided with screws or bolts. Heretofore, in practice, the toggle connection in pneumatic drills has been secured or clamped by either nuts or screw bolts. Never less than four nuts and in some instances as many as twelve screws or bolts have been used to secure the four connecting rods to their respective toggles or crank connections. In my present construction no bolts or nuts are used.

lVhere bolts or nuts are used, their tightness is always uncertain and unreliable, besides which they are sometimes inadvertently broken in the ori inal assembly by being set up too tight. I iasmuch as machines of this kind must of necessity be light so as to be readily portable, the parts and fastening devices must be small which introduces a further factor of danger in so far as fastening devices are concerned. According to my invention, these objections are overcome by the provision of a simple and strong construction eliminating nuts and bolts and using only one pin to a pair of rods, which pin is securely retained except as against positive force when it is desired to disassemble the toggle.

In the drawings Figure 1 is a sectional elevation of a drill in which my invention is embodied; Fig. 2 a side elevation of a pair of pistons, connecting rods and their toggle connection with a crank; Fig. 3 a section thereof; Fig. 4 a section on the line 4-4 of Fig. 2; Fig. 4 a'detail of a. spring; Fig. 5 a

section on line 5-5 of Fig. 2; Fig. 6 a side elevation of the toggle open; Figs. 7 and 8 side and edge views of one of the rods; Fig.

95 .9 aplan view showing the toggle open; Fig.

Specification of Letters Patent.

Patented Jan. 24, 1922.

1920. Serial No. 398,118.

10 a side elevation of a modified form of toggle; Fig. 11 a section on the line 1111 of Fig. 10; Fig. 12 a section on the line 12-12 of Fig. 11; Figs. 18 and 14 side and edge views of one of the rods; Figs. 15 and 16 edge and plan views of the split bushing.

Referring to the form shown in Figures 1 to 9, the pair of connecting rods comprise the two members 1 and 2, the former of which will, for convenience, be designated the outside rod and the latter the inside rod. The rod 1 is made integral with its portion of the toggle connection, which portion is a substantially semi-circular member 3. The inner-curved face of this member is not smooth from end to end but provided with bearing surfaces at different distances from the central axis of the crank 4 as shown in section. These bearing surfaces comprise the two end bearings 5 for the crank, it central bearing 6 and two laterally disposed bearings 7 which bearings 6 and 7 are adapted to accommodate and receive the bearing end of the inside rod 2.

The toggle comprises further a hinged portion or cap 8 which is substantially semi circular and complementary to the member 3, being hinged to the latter member by means of a fixed pivot pin 9 passing through the two outside parallel lugs 10 of the cap 8 and the interposed lug 11 of the member 3.

The inside rod is provided at its inner end with a bearing connection consisting of a substantially semi-circular member 12 whose inner surface fits upon the crank 4 and whose outer surface is formed as shown in Figure 5, with a central raised portion 13 and two lateral portions 14. The portions 14 fit the bearings 7.7 and the portion 13 fits the central bearing 6. It will be understood that the cap 8 has a slot 15 to permit of angular movement of the rod 2.

The toggle members or sections are secured together (after being assembled upon the crank) by a removable pin 16 which is held there by a spring retainer. The preferred construction is shown in Figure 4 wherein it is seen that the two free ends or arms of the yoke like cap 8' have transverse holes 17 and 18 respectively. for such pin. The hole 17 is of two diameters, the larger to receive one end of the pin and the smaller to admit a drift pin to force out the fastening pin when it is desired to disassemble the toggle. The other hole 18 is of one diameter passes through the two arms of the cap and through the interposed rod 1 near the base thereof. The pin may, if desired,-be made hollow for sake of lightness.

In this construction, the toggle itself and the end of the rod 2 performs the ofiice of r a bushing so that no special bushing is required. In the modified form of construc tion, the equivalent of a bushing is provided, the same consisting of two sections 22 and 23, the former corresponding to the member 12 of the other form, or the latter comprising a half bushing, having two outer bearing surfaces 25 of the toggle portion 26 of the outer rod 27, to thereby permit of the angular movement of the two rods. half bushing 23' has a central portion 28 which is of a slightly greater radius than the bearings 25 and fits in the central groove 29 inthe inner face of the toggle portion 26. The bushing half 22 is secured rigidly to or forms a part of the inside rod 30. The bushing sections are provided with oil holes 31 and 32 and the groove 29 with an oil hole 33, for proper lubrication of the toggle and crank. 1 V

I claim 1. A toggle connection for connecting rods comprising, in combination with a pair of rods cooperating with a single crank, asubstantially sem circular toggle member at the ber, means for securing the free end of the second toggle member to the other member,

the other rod having at its innerend a bearmg confined within the toggle members when closed, saidmoans comprising a transverse removable pin passing throughsaid two toggle members, and yielding means for holding said pin in place except as againstthe application of positive force.

2. A toggle connection for connecting rods comprising, in combination with a pair of rods cooperating with a single crank, a substantially semicircular toggle member at the inner end of one rod, a second'substantially semicircular toggle member, means for securing one end of the second toggle member to the other member, the other rod havingat its inner end a bearing confined within thetoggle members when closed, saidjme'anscomprising a transversevpin passing through said toggle members and a spring for-removably holding said pin in place.

3. A toggle connection for connecting rods This vment except comprising, in combination with a pair of rods cooperating with a single crank, a substantially semicircular toggle member at the inner end of one rod, a second substantially semicircular toggle member,

means for securing one end of the second 7 holes and said interposed portion, one end of the pin received by'the larger diameter of the hole of one of the arms.

4. A ,toggle connection for connecting rods comprising, in combination with a pair of rods cooperating with a single crank, a substantially semicircular toggle .member at the inner end of one rod, a

second substantiallysemicircular toggle member, means for securing one end of the second. toggle member to the othermember, the other rod-having at its inner end a bearing confined within the toggle members when closed, said second toggle memher having a pair ofarms provided with transverse holes-and said'firsttoggle member having a portion provided with a registering hole and,v interposed between said two arms, the hole in. one arm' having a circumferential groove, a coiled spring in said groove, said securing means comprising a transverse pin received by said holes and acted-on by the spring to prevent displaceon application of positive force, T

'5. A toggle. connection for connecting rods, comprising, in combination with a pair. of rods cooperating with a single crank, a asubstantiallyisemicircular toggle member at theinner end of one rod, a

second; substantially semicircular toggle member. pivoted at one end to the outer end of the first toggle member, means for securing the free end of the second toggle member to the other member, the other rod l'iavingat its'inner enda bearing confined within the toggle members when closed, said first toggle having on itsinner face bearing surfaces at its ends and intermediate bearing surfaces at a greater distance from the crank axis, the bearing end; of the second" rod having surfaces cooperating with said intermediate bear ng surfaces.

6.:A toggle connection forconnecting rods,

comprising, incombination with a pair of rods cooperating with a smgle 7 crank, a' substantially semi circular toggle member at the inner end of one rod, a second substantially semi-circular toggle member pivoted at one end to the outer end-of the first toggle member, means for connecting said members together, the other rod having at its inner end a bearing confined within the toggle members when closed, said first toggle having on its inner face bearing surfaces at its ends, a pair of intermediate bearing surfaces at a greater distance from the crank axis than the end bearing surfaces, and a central bearing surface at a still greater distance from said axis, the bearing end of the second rod having surfaces cooperating with the intermediate surfaces and with the central surface.

7. Connecting rods and toggle for drills comprising two such rods, one having apartial bearing to accommodate a crank pin common to both rods, and a toggle formed in two parts hinged to each other, one part being integral with the other of said rods and forming a portion of the bearing for the crank pin, and the other part being similar, said two parts each having substantially semi-circular recesses to receive said partial bearing of the first named rod, and means for detachably securing said two toggle parts together.

HENRY J. KIMMAN. 

